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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 10
Ann. Geophys., 13, 1117–1123, 1995
https://doi.org/10.1007/s00585-995-1117-5
© European Geosciences Union 1995
Ann. Geophys., 13, 1117–1123, 1995
https://doi.org/10.1007/s00585-995-1117-5
© European Geosciences Union 1995

  31 Oct 1995

31 Oct 1995

Anomalous enhancement in daytime 40-kHz signal amplitude accompanied by geomagnetic storms, earthquakes and meteor showers

B. K. De and S. K. Sarkar B. K. De and S. K. Sarkar

Abstract. Anomalous propagational characteristics, daytime signal levels greater than night-time, were observed. The amplitude records of a 40-kHz signal propagated over a distance of 5100 km from Sanwa, Japan to Calcutta along a low-latitude path show higher signal strength at midday compared to the midnight level on days preceded by principal geomagnetic storms, earthquakes and major meteor showers. This is explained by the increased ionization in the D-region following geophysical events. The storm after-effects only have a duration of a single day in this low-latitude path.

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